EP2532509A2 - Images de dispositif optiquement variable (OVD) incorporées dans des bandes de plastique - Google Patents

Images de dispositif optiquement variable (OVD) incorporées dans des bandes de plastique Download PDF

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Publication number
EP2532509A2
EP2532509A2 EP12171048A EP12171048A EP2532509A2 EP 2532509 A2 EP2532509 A2 EP 2532509A2 EP 12171048 A EP12171048 A EP 12171048A EP 12171048 A EP12171048 A EP 12171048A EP 2532509 A2 EP2532509 A2 EP 2532509A2
Authority
EP
European Patent Office
Prior art keywords
optically transparent
strip
optically
variable device
embossing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12171048A
Other languages
German (de)
English (en)
Other versions
EP2532509B1 (fr
EP2532509A3 (fr
Inventor
George V. Masi
Mark Mancilla
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nekoosa Coated Products LLC
Original Assignee
CET FILMS CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CET FILMS CORP filed Critical CET FILMS CORP
Publication of EP2532509A2 publication Critical patent/EP2532509A2/fr
Publication of EP2532509A3 publication Critical patent/EP2532509A3/fr
Application granted granted Critical
Publication of EP2532509B1 publication Critical patent/EP2532509B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0011—Combinations of extrusion moulding with other shaping operations combined with compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1828—Diffraction gratings having means for producing variable diffraction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1847—Manufacturing methods
    • G02B5/1852—Manufacturing methods using mechanical means, e.g. ruling with diamond tool, moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
    • B29C2059/023—Microembossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/002—Combinations of extrusion moulding with other shaping operations combined with surface shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads

Definitions

  • This invention relates to a method to manufacture an optically transparent plastic strip, that could be film or sheet, used to secure information contained on a credit card or identification card. More particularly, an optically variable device, such as a diffractive pattern or hologram, is embossed into a thermoplastic during an extrusion process.
  • an optically variable device such as a diffractive pattern or hologram
  • plastic strips with overt and covert security features has become prevalent in the manufacture of secure cards used in applications such as financial transactions and identification cards.
  • Plastic strips with laser engravable additives have added to the functionality and the ability to secure such cards.
  • diffractive structures such as holograms
  • the secondary film is laminated to a plastic overlay.
  • the secondary film is bonded to the plastic overlay by hot stamping.
  • secondary diffractive coatings are cast onto a polycarbonate film. To protect the integrity of the diffractive structure, the secondary film is usually covered with a topcoat.
  • United States Patent No. 5,331,443 discloses a composite film having a hologram embossed into one film layer and coated with a reflective metalized layer. A laser selectively etches unique indicia into the metalized layer. The composite film is bonded to a substrate that may be transparent or opaque.
  • United States Patent No. 5,815,292 discloses a first transparent film layer that is embossed with a first surface relief diffracting pattern and partially coated with a first metallization layer.
  • the first transparent film layer is bonded to a second transparent film layer having a second surface relief diffracting pattern and coated with a second metallization layer.
  • the film assembly is then bonded to a substrate to be authenticated with an adhesive.
  • the adhesive is stronger than any of the film assembly bonds such that the assembly will be damaged if an attempt is made to remove it from the substrate.
  • United States Published Patent Application, Publication No. US 2009/0251749 Al discloses a hologram containing overlay for fusing to a substrate.
  • the overlay has a polycarbonate base, a diffractive pattern is formed on the base and coated with a reflection enhancing layer.
  • the diffractive layer is preferably applied by a casting process, although embossing may be utilized.
  • Embossed holograms are disclosed to be less desirable than cast holograms because the conventional embossed hologram base is a thermo compliant material; thus the image is formed by applying pressure only. As a result, it is subject to distortion in a vigorous lamination or embedding process required for polycarbonate card manufacturing.
  • a method for the manufacture of a plastic strip useful to secure information contained on a face of a secure card or document includes extruding a polymer resin to form an optically transparent sheet and then embossing an optically variable device into a first surface of this optically transparent sheet.
  • a plastic strip useful to secure information contained on a face of a secure card or document has an optically transparent substrate with a nominal thickness and an optically variable device embossed into a first surface of that optically transparent substrate.
  • said polymer resin may be selected to contain polycarbonate.
  • said optically transparent strip may exit an extruder at a temperature of between 120°C and 320°C.
  • said optically transparent sheet may be embossed at a temperature of between 145°C and 210°C.
  • a time from exiting said extruder until said embossing step may be effective to prevent said optically transparent strip from cooling to a temperature below 120°C. In particular, said time may be less than 3 seconds.
  • said embossing step may include passing said optically transparent strip through a pair of rolls having a nip defining an embossed optically transparent strip thickness, said pair of rolls working in conjunction with a textured image(50) having a mirror image of said optically variable device.
  • said embossed optically transparent strip thickness may be from 50% to 100% of the thickness of said optically transparent strip thickness prior to said embossing step.
  • At least a portion of said optically variable device is metallized.
  • security features may be laser engraved into said optically transparent strip following embossing.
  • said optically transparent strip is bonded following embossing to said face of said card.
  • said optically transparent substrate may include essentially a thermoplastic resin.
  • a metallization layer may be disposed on peaks of said optically variable device.
  • security features may be formed into said first surface.
  • a “film” has a nominal thickness of between 0.025 mm and 0.79 mm (0.001 inch and 1/32 inch).
  • a “sheet” has a nominal thickness in excess of 0.79 mm (1/32 inch).
  • a “strip” encompasses both film and sheet.
  • “Optically transparent” means that text, numbers, figures and the like on one side of the strip may be accurately scanned by an electronic device or accurately perceived by a person from the opposing side of the strip even though the light transmission through the strip may be less than 100%.
  • FIG. 1 shows in cross-sectional representation, a plastic strip 10 as known from the prior art.
  • the plastic strip 10 may be used to authenticate information contained on a secured device, such as a credit card, driver's license or passport.
  • a secured device such as a credit card, driver's license or passport.
  • the authenticity of the information, such as a picture or a social security number is secured by anti-counterfeiting characteristics of the plastic strip 10.
  • the plastic strip 10 includes an optically transparent plastic film layer 12 and a security layer 14 bonded together at a first surface 16 of the optically transparent plastic film layer 12.
  • the security layer 14 is a plastic film layer that has an optically variable device (OVD) 18, such as a diffractive structure, for example, a hologram, formed thereon such as by casting or embossing.
  • ODD optically variable device
  • the security layer 14 further has a metalized layer 20, such as a layer of aluminum. Portions of the metalized layer may be removed, such as by chemical etching or laser ablation, to leave a reflective pattern that contributes to the uniqueness of the plastic strip 10.
  • a protective coating layer 22 prevents damage to the OVD 18 and to the reflective pattern.
  • the security layer 14 is bonded to the first surface 16 of the optically transparent film layer 12, such as by an adhesive 24.
  • an adhesive 24 is also known to cast the optically variable device 18 directly on the first surface 16, however, that process has been found to be slow and to add complexity to the overall construction of the plastic strip.
  • FIG. 2 is a cross sectional representation of a plastic substrate 30 in accordance with an embodiment of the present disclosure.
  • the plastic substrate 30 is formed from a mechanically deformable, optically transparent polymer, such as polycarbonate or otherthermoplastic resin. This polymer is compounded, as described below, to include an additive to facilitate laser engraving, such as carbon black.
  • An optically variable device 32 such as a diffractive structure, for example, a hologram, is embossed directly into a first surface 34 of the plastic substrate 30.
  • a metalized layer 36 is formed over all, or over selected portions, of the first surface 34 resulting in a reflective pattern.
  • Figure 3 illustrates the plastic substrate 30 in a bottom view showing a pattern 38 corresponding to the peaks and valleys of the embossed structure in a first portion 40 and the absence of the peaks and valleys in a non-embossed second portion 42.
  • the patterned metallization layer 36 may overlie all of selected regions of one or both of the first portion 40 and the second portion 42.
  • Additional security features may be etched directly into either side of the plastic strip 30 by laser ablation. Such additional security features may include an issuer's name and/or logo, unique words, numbers, pictures or the like.
  • a method for the manufacture of the plastic substrate 30 illustrated in Figures 2 and 3 includes the steps of compounding resin constituents having, by weight, 50% - 99 % of polycarbonate as the polymer, 1% - 40 % of carbon black or other additive to enhance laser engraving, and optionally 1% - 30 % of pigment as colorant to form an extrudable resin.
  • the resin is extruded into an optically transparent strip using pressure and heat.
  • the strip will exit the extruder at a temperature of between 120°C and 320°C and preferably between 145°C and 320°C.
  • the extruded strip is directed to a pair of rolls 44 for embossing while at a temperature above 120°C and preferably between 145°C and 210°C.
  • the time from exiting the extruder to entering the embossing rolls is under three seconds.
  • Rolls 46 and 48 are used in conjunction with a textured image 50 to create the optically variable device 32.
  • the spacing between first roll 46 and second roll 50 is effective to reduce the thickness of the plastic substrate by up to 50% producing a compressive force 52 applied at the roll nip forcing the mirror image of the textured image 50 pattern into first surface 34 of the plastic substrate.
  • the thermoplastic strip containing the embossed optically variable device is cooled and available for further processing, such as metallization and laser engraving.
  • the plastic substrate 30 is not formed from an optically transparent material and is translucent or opaque. In which case, the security features are viewed through the card or other structure bonded to the substrate.
  • thermoplastic resins may be used in the extrusion process to create a film or sheet. Accordingly, other embodiments are within the scope of the following claims.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)
EP12171048.7A 2011-06-09 2012-06-06 Images de dispositif optiquement variable (OVD) incorporées dans des bandes de plastique Active EP2532509B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/156,387 US10434689B2 (en) 2011-06-09 2011-06-09 Optically variable device (OVD) images embedded within plastic strips

Publications (3)

Publication Number Publication Date
EP2532509A2 true EP2532509A2 (fr) 2012-12-12
EP2532509A3 EP2532509A3 (fr) 2013-10-16
EP2532509B1 EP2532509B1 (fr) 2022-02-16

Family

ID=46178490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12171048.7A Active EP2532509B1 (fr) 2011-06-09 2012-06-06 Images de dispositif optiquement variable (OVD) incorporées dans des bandes de plastique

Country Status (2)

Country Link
US (2) US10434689B2 (fr)
EP (1) EP2532509B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104057747A (zh) * 2013-11-22 2014-09-24 中钞特种防伪科技有限公司 一种制备光学防伪元件的方法
WO2017109120A1 (fr) * 2015-12-22 2017-06-29 Bundesdruckerei Gmbh Procédé de fabrication d'un document de sécurité et document de sécurité
CN110670839A (zh) * 2019-10-24 2020-01-10 安徽森泰木塑科技地板有限公司 具有木材纹理的发泡地板

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWM429700U (en) * 2012-01-19 2012-05-21 Benq Materials Corp Engraving device

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US5331443A (en) 1992-07-31 1994-07-19 Crown Roll Leaf, Inc. Laser engraved verification hologram and associated methods
US5815292A (en) 1996-02-21 1998-09-29 Advanced Deposition Technologies, Inc. Low cost diffraction images for high security application
US20090251749A1 (en) 2008-04-08 2009-10-08 Jds Uniphase Corporation Ovd containing device

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US20070195392A1 (en) 1999-07-08 2007-08-23 Jds Uniphase Corporation Adhesive Chromagram And Method Of Forming Thereof
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US20040144479A1 (en) 2003-01-23 2004-07-29 Peter Cueli Preparation of novel physical transfer elements such as hot stamping foil and methods for using the same in producing chemically resistant bonds
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EP2012173A3 (fr) 2007-07-03 2009-12-09 JDS Uniphase Corporation Éléments optiques diffractifs non gravés plains à sélection de polarisation
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US5331443A (en) 1992-07-31 1994-07-19 Crown Roll Leaf, Inc. Laser engraved verification hologram and associated methods
US5815292A (en) 1996-02-21 1998-09-29 Advanced Deposition Technologies, Inc. Low cost diffraction images for high security application
US20090251749A1 (en) 2008-04-08 2009-10-08 Jds Uniphase Corporation Ovd containing device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104057747A (zh) * 2013-11-22 2014-09-24 中钞特种防伪科技有限公司 一种制备光学防伪元件的方法
CN104057747B (zh) * 2013-11-22 2016-03-23 中钞特种防伪科技有限公司 一种制备光学防伪元件的方法
WO2017109120A1 (fr) * 2015-12-22 2017-06-29 Bundesdruckerei Gmbh Procédé de fabrication d'un document de sécurité et document de sécurité
CN110670839A (zh) * 2019-10-24 2020-01-10 安徽森泰木塑科技地板有限公司 具有木材纹理的发泡地板
WO2021077509A1 (fr) * 2019-10-24 2021-04-29 安徽森泰木塑科技地板有限公司 Lame de plancher en mousse à texture de bois

Also Published As

Publication number Publication date
US20190381705A1 (en) 2019-12-19
US20120313365A1 (en) 2012-12-13
EP2532509B1 (fr) 2022-02-16
US10434689B2 (en) 2019-10-08
EP2532509A3 (fr) 2013-10-16

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